Bump OpenAI text-generation model for baibot (`gpt-5` -> `gpt-5.1`)

roles/custom/matrix-bot-baibot/defaults/main.yml

@@ -368,7 +368,7 @@ matrix_bot_baibot_config_agents_static_definitions_openai_config_api_key: ""
 
 matrix_bot_baibot_config_agents_static_definitions_openai_config_text_generation_enabled: true
 # For valid model choices, see: https://platform.openai.com/docs/models
-matrix_bot_baibot_config_agents_static_definitions_openai_config_text_generation_model_id: gpt-5
+matrix_bot_baibot_config_agents_static_definitions_openai_config_text_generation_model_id: gpt-5.1
 # The prompt text to use (can be null or empty to not use a prompt).
 # See: https://huggingface.co/docs/transformers/en/tasks/prompting
 matrix_bot_baibot_config_agents_static_definitions_openai_config_text_generation_prompt: "{{ matrix_bot_baibot_config_agents_static_definitions_prompt }}"